Out: 220 mail.example.com ESMTP Postfix (2.5.0)                                                         
 In:  EHLO unix18.sihope.com                                                                                  
 Out: 250-mail.example.com                                                                               
 Out: 250-PIPELINING                                                                                          
 Out: 250-SIZE 20480000                                                                                       
 Out: 250-ETRN                                                                                                
 Out: 250-STARTTLS                                                                                            
 Out: 250-AUTH PLAIN LOGIN                                                                                    
 Out: 250-ENHANCEDSTATUSCODES                                                                                 
 Out: 250-8BITMIME                                                                                            
 Out: 250 DSN                                                                                                 
 In:  STARTTLS                                                                                                
 Out: 220 2.0.0 Ready to start TLS                                                                            
 In:  EHLO unix18.sihope.com                                                                                  
 Out: 250-mail.example.com                                                                               
 Out: 250-PIPELINING                                                                                          
 Out: 250-SIZE 20480000                                                                                       
 Out: 250-ETRN                                                                                                
 Out: 250-AUTH PLAIN LOGIN                                                                                    
 Out: 250-ENHANCEDSTATUSCODES                                                                                 
 Out: 250-8BITMIME                                                                                            
 Out: 250 DSN                                                                                                 
 In:  MAIL From:<calls@example2.com> SIZE=1565                                                      
 Out: 250 2.1.0 Ok                                                                                            
 In:  RCPT To:<KELLI@EXAMPLE.COM>                                                                        
 Out: 451 4.3.0 <KELLI@EXAMPLE.COM>: Temporary lookup failure                                            
 In:  RCPT To:<MARC@EXAMPLE.COM>                                                                         
 Out: 451 4.3.0 <MARC@EXAMPLE.COM>: Temporary lookup failure                                             
 In:  DATA                                                                                                    
 Out: 554 5.5.1 Error: no valid recipients                                                                    
 In:  RSET                                                                                                    
 Out: 250 2.0.0 Ok                                                                                            
 In:  QUIT